Oxidation involves loss of electrons and increase in oxidation number.

Reduction involves gain of electrons and decrease in oxidation number.

Example:

The magnesium's oxidation state has increased from 0 to +2 , it has been oxidised. Magnesium acts as reducing agent. The hydrogen's oxidation state has decreased from +1 to 0 , it has been reduced. The hydrogen ion acts as a oxidising agent.

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There is no change in oxidation number. Therefore, this is not a redox reaction.

Momentum is defined as the product of mass and velocity. The principle of conservation of momentum states that in a system of collision...

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The Power of Teachers

"Any nation is as great, as good, as its citizens make it........It is teachers more than any other single group of people who determine attitudes, and who shape the ideas and aspirations of the nation." Julius Nyerere, 1966